Synopsis : 
Fritz Lang, a major director of the 20th century, began his career with a series of German films. "Metropolis" - shot just a century ago - is the first film in History to be classified as a UNESCO World Heritage Site... But who still mentions the name of its screenwriter, Thea Von Harbou? "The Nibelungen", "Mabuse" and "M", which Lang himself considered to be his best film, were also written by her. From 1933 onwards, Lang and Von Harbou, divorced, no longer had any direct contact.

Fritz Lang was forced into exile - first in Paris, where he made "Liliom" (1934),
then in Hollywood where the second part of his career took place.
Von Harbou, for her part, remained in Germany and joined the Nazi party (NSDAP)
in 1941. On July 1, 1954, she died accidentally after a fall at the Berlin
festival.

Back in Germany in the 1950s, Fritz Lang chose to bring to the screen two
screenplays based on Von Harbou's novels, "The Hindu Tomb" and "The Bengal Tiger" "Thea and Fritz, the Lovers of Metropolis" - explores the cinematographic work of this couple as talented as they are prolific, at first fused, then separated by the darkest episode of the 20th century.